I received my STD test for herpes back and it came back negative. But I have been having breakouts that are similar to the description of herpes, and I have a lump
should be investigated,but it's my guess you have a Haemorroid ......
Your Doctor would be the best person to ask about this as he will give you a proper examination.
If your Herpes test came back Negative then I wouldn't worry about it being that.